If “Cloverfield” — which plummeted 68 percent at the box office over the weekend, a sure sign of lethal word-of-mouth — fails to make it to $100 million domestic, it will be in extremely select company. Only one other title that opened at $40 million (a January record in the case of “Cloverfield”) or above achieved that dubious distinction, Jeff Bock of Exhibitor Relations tells me. That was “Scary Movie 4,” which topped out at $92.4 million after opening at $40.2 million. He cites a couple of other pictures that opened well and tailed off precipitiously: “Alien vs. Predator” premiered to $38.2 million on its way to $80.2 million, while “Daredevil” opened to $40.3 million and finished up its North American run with just $102.5 million.